mirror of https://github.com/python/cpython
246 lines
9.0 KiB
Python
246 lines
9.0 KiB
Python
"""Benchmark some basic import use-cases.
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The assumption is made that this benchmark is run in a fresh interpreter and
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thus has no external changes made to import-related attributes in sys.
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"""
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from test.test_importlib import util
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import decimal
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from importlib.util import cache_from_source
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import importlib
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import importlib.machinery
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import json
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import os
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import py_compile
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import sys
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import tabnanny
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import timeit
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import types
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def bench(name, cleanup=lambda: None, *, seconds=1, repeat=3):
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"""Bench the given statement as many times as necessary until total
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executions take one second."""
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stmt = "__import__({!r})".format(name)
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timer = timeit.Timer(stmt)
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for x in range(repeat):
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total_time = 0
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count = 0
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while total_time < seconds:
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try:
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total_time += timer.timeit(1)
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finally:
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cleanup()
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count += 1
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else:
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# One execution too far
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if total_time > seconds:
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count -= 1
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yield count // seconds
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def from_cache(seconds, repeat):
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"""sys.modules"""
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name = '<benchmark import>'
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module = types.ModuleType(name)
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module.__file__ = '<test>'
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module.__package__ = ''
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with util.uncache(name):
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sys.modules[name] = module
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yield from bench(name, repeat=repeat, seconds=seconds)
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def builtin_mod(seconds, repeat):
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"""Built-in module"""
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name = 'errno'
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if name in sys.modules:
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del sys.modules[name]
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# Relying on built-in importer being implicit.
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yield from bench(name, lambda: sys.modules.pop(name), repeat=repeat,
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seconds=seconds)
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def source_wo_bytecode(seconds, repeat):
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"""Source w/o bytecode: small"""
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sys.dont_write_bytecode = True
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try:
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name = '__importlib_test_benchmark__'
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# Clears out sys.modules and puts an entry at the front of sys.path.
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with util.create_modules(name) as mapping:
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assert not os.path.exists(cache_from_source(mapping[name]))
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sys.meta_path.append(importlib.machinery.PathFinder)
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loader = (importlib.machinery.SourceFileLoader,
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importlib.machinery.SOURCE_SUFFIXES)
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sys.path_hooks.append(importlib.machinery.FileFinder.path_hook(loader))
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yield from bench(name, lambda: sys.modules.pop(name), repeat=repeat,
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seconds=seconds)
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finally:
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sys.dont_write_bytecode = False
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def _wo_bytecode(module):
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name = module.__name__
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def benchmark_wo_bytecode(seconds, repeat):
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"""Source w/o bytecode: {}"""
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bytecode_path = cache_from_source(module.__file__)
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if os.path.exists(bytecode_path):
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os.unlink(bytecode_path)
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sys.dont_write_bytecode = True
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try:
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yield from bench(name, lambda: sys.modules.pop(name),
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repeat=repeat, seconds=seconds)
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finally:
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sys.dont_write_bytecode = False
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benchmark_wo_bytecode.__doc__ = benchmark_wo_bytecode.__doc__.format(name)
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return benchmark_wo_bytecode
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tabnanny_wo_bytecode = _wo_bytecode(tabnanny)
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decimal_wo_bytecode = _wo_bytecode(decimal)
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def source_writing_bytecode(seconds, repeat):
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"""Source writing bytecode: small"""
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assert not sys.dont_write_bytecode
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name = '__importlib_test_benchmark__'
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with util.create_modules(name) as mapping:
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sys.meta_path.append(importlib.machinery.PathFinder)
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loader = (importlib.machinery.SourceFileLoader,
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importlib.machinery.SOURCE_SUFFIXES)
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sys.path_hooks.append(importlib.machinery.FileFinder.path_hook(loader))
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def cleanup():
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sys.modules.pop(name)
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os.unlink(cache_from_source(mapping[name]))
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for result in bench(name, cleanup, repeat=repeat, seconds=seconds):
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assert not os.path.exists(cache_from_source(mapping[name]))
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yield result
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def _writing_bytecode(module):
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name = module.__name__
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def writing_bytecode_benchmark(seconds, repeat):
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"""Source writing bytecode: {}"""
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assert not sys.dont_write_bytecode
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def cleanup():
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sys.modules.pop(name)
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os.unlink(cache_from_source(module.__file__))
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yield from bench(name, cleanup, repeat=repeat, seconds=seconds)
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writing_bytecode_benchmark.__doc__ = (
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writing_bytecode_benchmark.__doc__.format(name))
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return writing_bytecode_benchmark
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tabnanny_writing_bytecode = _writing_bytecode(tabnanny)
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decimal_writing_bytecode = _writing_bytecode(decimal)
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def source_using_bytecode(seconds, repeat):
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"""Source w/ bytecode: small"""
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name = '__importlib_test_benchmark__'
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with util.create_modules(name) as mapping:
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sys.meta_path.append(importlib.machinery.PathFinder)
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loader = (importlib.machinery.SourceFileLoader,
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importlib.machinery.SOURCE_SUFFIXES)
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sys.path_hooks.append(importlib.machinery.FileFinder.path_hook(loader))
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py_compile.compile(mapping[name])
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assert os.path.exists(cache_from_source(mapping[name]))
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yield from bench(name, lambda: sys.modules.pop(name), repeat=repeat,
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seconds=seconds)
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def _using_bytecode(module):
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name = module.__name__
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def using_bytecode_benchmark(seconds, repeat):
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"""Source w/ bytecode: {}"""
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py_compile.compile(module.__file__)
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yield from bench(name, lambda: sys.modules.pop(name), repeat=repeat,
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seconds=seconds)
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using_bytecode_benchmark.__doc__ = (
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using_bytecode_benchmark.__doc__.format(name))
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return using_bytecode_benchmark
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tabnanny_using_bytecode = _using_bytecode(tabnanny)
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decimal_using_bytecode = _using_bytecode(decimal)
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def main(import_, options):
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if options.source_file:
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with options.source_file:
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prev_results = json.load(options.source_file)
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else:
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prev_results = {}
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__builtins__.__import__ = import_
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benchmarks = (from_cache, builtin_mod,
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source_writing_bytecode,
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source_wo_bytecode, source_using_bytecode,
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tabnanny_writing_bytecode,
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tabnanny_wo_bytecode, tabnanny_using_bytecode,
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decimal_writing_bytecode,
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decimal_wo_bytecode, decimal_using_bytecode,
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)
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if options.benchmark:
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for b in benchmarks:
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if b.__doc__ == options.benchmark:
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benchmarks = [b]
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break
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else:
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print('Unknown benchmark: {!r}'.format(options.benchmark),
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file=sys.stderr)
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sys.exit(1)
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seconds = 1
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seconds_plural = 's' if seconds > 1 else ''
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repeat = 3
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header = ('Measuring imports/second over {} second{}, best out of {}\n'
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'Entire benchmark run should take about {} seconds\n'
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'Using {!r} as __import__\n')
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print(header.format(seconds, seconds_plural, repeat,
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len(benchmarks) * seconds * repeat, __import__))
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new_results = {}
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for benchmark in benchmarks:
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print(benchmark.__doc__, "[", end=' ')
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sys.stdout.flush()
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results = []
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for result in benchmark(seconds=seconds, repeat=repeat):
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results.append(result)
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print(result, end=' ')
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sys.stdout.flush()
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assert not sys.dont_write_bytecode
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print("]", "best is", format(max(results), ',d'))
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new_results[benchmark.__doc__] = results
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if prev_results:
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print('\n\nComparing new vs. old\n')
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for benchmark in benchmarks:
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benchmark_name = benchmark.__doc__
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old_result = max(prev_results[benchmark_name])
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new_result = max(new_results[benchmark_name])
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result = '{:,d} vs. {:,d} ({:%})'.format(new_result,
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old_result,
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new_result/old_result)
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print(benchmark_name, ':', result)
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if options.dest_file:
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with options.dest_file:
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json.dump(new_results, options.dest_file, indent=2)
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if __name__ == '__main__':
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import argparse
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parser = argparse.ArgumentParser()
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parser.add_argument('-b', '--builtin', dest='builtin', action='store_true',
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default=False, help="use the built-in __import__")
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parser.add_argument('-r', '--read', dest='source_file',
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type=argparse.FileType('r'),
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help='file to read benchmark data from to compare '
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'against')
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parser.add_argument('-w', '--write', dest='dest_file',
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type=argparse.FileType('w'),
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help='file to write benchmark data to')
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parser.add_argument('--benchmark', dest='benchmark',
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help='specific benchmark to run')
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options = parser.parse_args()
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import_ = __import__
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if not options.builtin:
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import_ = importlib.__import__
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main(import_, options)
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